1. Refinements to the diagnostic cost group (DCG) model;Ellis;Inquiry,1995
2. Diagnosis-based risk adjustment for Medicare capitation payments;Ellis;Health Care Fin Rev,1996
3. The APACHE III Prognostic System: risk prediction of hospital mortality for critically ill hospitalized adults;Knaus;Chest,1991
4. Measuring severity of illness: six severity systems and their ability to explain cost variations;Thomas;Inquiry,1991
5. Ambulatory care groups: a categorization of diagnoses for research and management;Starfield;Health Serv Res,1991